The utility model discloses an oil level detection device, turn over the board indicator including oil level pipe and the magnetism that is fixed in oil level outside of tubes portion, the oil level intraduct be equipped with magnetic floater and its bottom be used for with the bottom intercommunication of oil conservater, magnetism turns over inside being equipped with along a plurality of magnetism upset post of axle arrangement and outside of board indicator and is equipped with the scale, the N of every magnetism upset post extremely scribbles first instruction look and S and extremely scribbles and instruct the look with first instruction look different second. This scheme utilizes the principle of linker to make the insulating oil stream in the oil conservater go into in the oil level pipe, magnetic floater goes up and down along with intraductal oil level and realizes 180 upsets through magnetism coupling drive magnetism upset post, thereby make magnetism upset post demonstrate a kind in two kinds of instruction looks to the outside, two kinds instruct that the look juncture corresponds highly then be the actual oil level height inside the oil conservater, realize the accurate measurement to the oil level through reading the corresponding scale interval of two look junctures, this detection device can go on in the measurement with electricity, high convenience and high speed are obtained.